I did a simple test of wide field photography with the Canon EOS R5, 100-500mm f4.5-7.1 at 100mm f/5, 13 frames at 5 seconds each and a dark frame, ISO 20,000, taken at 9:27pm PDT on 10/18/20. Camera was placed on a picnic table and put on 2-second delay timer, Image stabilization was on. I stacked the frames in Lynkeos and then processed in Adobe Photoshop to remove the dark frame, then adjusted some more in Adobe Lightroom. Resized smaller to make processing go faster.